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Debt - Notes Offering (Details) - USD ($)	Mar. 14, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument		$ 3,127,000,000	$ 2,998,000,000
5.500% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate		5.50%	5.50%	5.50%
5.500% Senior Notes due 2026 | Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 325,000,000	$ 325,000,000
Interest rate	5.50%	5.50%
Due date of senior secured notes	2026
6.750% Senior Notes
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 523,000,000
Interest rate	6.75%	6.75%	6.75%	6.75%
6.750% Senior Notes | Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 112,000,000

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Debt instrument maturity year.

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